Multi-Family Dwellings
(Difficult Questions)
Dwelling Unit
Voltage drop and Dwellings
Motor and AC Calculations
Conductor Sizing and Protection
100
What is the feeder/service calculated load for twenty 15.60KVA ranges?
What is 42KVA
100
What is the minimum branch circuit conductor ampacity for one 6KVA counter mounted cooking unit(cooktop) and two 4KVA wall mounted ovens?
What is 37A
100
What is the NEC minimum recommended operating volts for a 115V rated load that's connected to a 120V source?
What is 114V
100
What is the NEC FLC for a 5hp 230V ac single phase motor?
What is 28A
100
What size service entrance conductor are required for a 200A continuous load, if the terminal are rated for 75 degrees celsius
What is 250kcmil
200
A 30 Unit multifamily dwelling building contains a 5.25 kva electric clothes dryer in each unit. What is the feeder service dryer calculated load for the building?
What is 50KVA
200
What is the feeder service calculated load for a dishwasher(1250va), waste disposal(940VA), and a water heater(4500VA)?
What is 6690VA
200
A 240 V, 24A, single phase load is located 100ft from the panel board and is wired with 10AWG. What is the voltage drop of the circuit conductor?
What is 5.76V
200
What size branch circuit conductors are required for a 71/2 hp, three phase, 230V motor?
What is 10AWG
200
What is the ampacity of # 12THHN when installed in a location that has an ambient temperature of 50 degrees F?
What is 34.50A
300
What size service copper conductors are required for a 120/240V, single phase multifamily building that has a calculated load of 93kva?
What is 600kcmil
300
What is the calculated VA load for a 230V single phase air conditioner that contains a 16A compressor and a 1A fan?
What is 4KVA
300
What size conductor should be used to limit the voltage drop from exceeding three percent if the appliance nameplate indicates 18A at 460V, three phase and it's located 100ft from the power supply? The terminals are rated for 75 degrees Celsius.
What is 12AWG
300
If a duel element fuse is used for overload protection, what size fuse is required for a 5hp, 230v, single-phase motor, with a service factor of 1.16, if the motor nameplate current rating is 28A
What is 35A
300
What is the ampacity of each #10THHN conductor when four current carrying conductors are installed in a raceway or cable in a dry location?
What is 32A
400
After the rest of the questions in this column being so hard, I figured I could give you one freebie. :-)
What is 400 point free
400
What is the general lighting and receptacle, small appliance, and laundry feeder/service calculated load for a 2700 sq ft dwelling unit?
What is 6360VA
400
What is the general lighting and receptacle load for a 2000sq. ft. dwelling unit that has 34 convenience receptacles and 12 luminaires rated at 100 W each?
What is 6000 VA
400
What size conductor and inverse time breaker are required for a 2hp, 230V, single phase motor?
What is 14AWG, 30A breaker
400
What is the maxium size overcurrent protection for a 4500W, 240V water heater?
What is 30A pg 183 Exam prep book
500
What is the calculated load for a 25 unit apartment building? The system voltage is 120/240V single phase. Each apartment is 1000 sq ft and contains the following Waste disposal(1.5KVA), Dishwasher(1.2KVA), Water Heater(4.5KVA), Dryer(4.5KVA), Range(15.5KVA), Air Conditioning(230V 28A), Electric Space Heating(7.50KVA)
What is 475KVA
500
What is the general lighting and receptacle small appliance and laundry feeder/service calculated load for a 6540 sq ft dwelling unit?
What is 10392VA
500
What is the minimum branch circuit conductor ampacity for one 14KVA range?
What is 37A
500
A 70 amp duel- element fuse is used for overload protection for a 50hp, 460V three phase motor, with a temperature rise of 39 degrees C, and a motor nameplate current rating of 60A(FLA) If the motor is unable to start, what's the maximum size overload allowed?
What is 80A
500
What size Conductor and overcurrent device are required for a 9600 W, 240V fixed electric space heater(with 75 degree Celsius terminals) that has a 3 A blower motor?
What is 6AWG, 60amp pg 184 Exam prep book
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